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Cost Of Replacing Obsolete Equipment Can Help Sell HVAC Upgrade
December 17, 2014
The cost for the new VFD chiller system is estimated to be $250,000. This would correspond to a simple payback of close to 15 years. If the analysis included the cost to replace the unit with a constant speed chiller (assuming the cost of $203,000), the difference in capital costs is only $47,000 and the simple payback would be reduced to 2.8 years. Even if the analysis assumed that the constant speed chiller was installed with the original efficiency (0.70 kW/ton) the simple payback is still 4.3 years. Very careful calculations are required to ensure that deferred capital calculations are accurate.
It is difficult to identify the deferred capital savings in terms of simple payback when evaluating equipment that still has useful remaining life. The cost to replace the equipment cannot be simply subtracted from the cost of the energy conservation measure. However, a complete life cycle cost analysis can be completed to identify the most economical approach.
This brief came from Andy Jones, mechanical engineer/project manager at RMF Engineering.
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